according to a survey, Americans of Middle Easten descent were twice as likely -----------------------------------
1. as was the national average to be self-employeed
2.as the average American to be self-emplyeed
答案给的是2,好像1中的was是可以省可以不省的,没有说必然错把如果省了,那这句的答案优于1的原因是什么呢?
the national average 与主句主语Americans of …不能对应。
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